Preservation of natural conditions,

"Reprinted for the Committee, 1921, with the aid of the National research council."

Transactions of the Royal Entomological Society of London.

The earlier volumes were issued in series as follows: volumes 1-5 (1834/1836-1847/1849); new series, volumes 1-5 (1850/1852-1859/1861); 3d series, volumes 1-5 (1862/1864-1865/1868) From 1868-1925 the volumes were not numbered; in 1926 a consecutive numbering as from the beginning was adopted, thus the 3 earlier series form volumes [1-15]; 1868-1925 form volumes [16-73]; 1926- form volumes 74- .